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Further Workplace Health and Safety bosses will be grilled at the inquest into the Dreamworld disaster today, after a leading inspector admitted he had "no confidence" in the emergency procedures in place on the Thunder River Rapids ride.

"Shortly after January 20, I took up something like a semipermanent seat on a court in the West Wing," he wrote in his book Fire and Fury: A Year in the Trump White House.

"There was no one to say 'Go Away'. Hence I became more a constant interloper than an invited guest – something quite close to an actual fly on the wall – having accepted no rules nor having made any promises about what I might or might not write."

During that time Wolff gathered countless unflattering anecdotes about President Trump and his staff, purportedly gathered from more than 200 interviews.

Some of those anecdotes have been disputed or denied, but others have been confirmed.

Former White House deputy chief-of-staff Katie Walsh was quoted as saying working with Trump was like "trying to figure out what a child wants".

She has denied making the comments, but Wolff purportedly has Walsh, and many others, on tape.

Steve Bannon. (AAP) ()

Several of the juiciest details in the book came from a private dinner between the White House's Steve Bannon and former Fox News boss Roger Ailes.

The private dinner was one hosted by Wolff at his Manhattan townhouse.

"So I was one of the six guests at the Bannon-Ailes dinner party in January 2017 and every word I've seen from the book about it is absolutely accurate," Hollywood Reporter's co-president Janice Min tweeted.

"It was an astonishing night."

According to Esquire, Wolff has a reputation for printing off-the-record conversations.

One particular anecdote from the book has come under particular scrutiny.

Ailes reportedly suggested to Trump before his inauguration that he hire former Speaker John Boehner as his chief-of-staff.

"Who's John Boehner?" Trump purportedly asked.

That account flies in the face of Trump's Twitter history, with the president mentioning Boehner on several different occasions dating back to 2011.

"More lies, go back and look, Boehner and #potus (President of the United States) spent time together well before the election," Donald Trump Jr tweeted.

"Just another pathetic attempt to smear @realdonaldtrump #fakenews."

Fire and Fury: Inside the Trump White House was scheduled for release on Tuesday, but will now be available tomorrow.